:root {
    --color-text: #25282d;
    --color-muted: #686d75;
    --color-subtle: #a2a6ab;
    --color-disabled: #b4b7bb;
    --color-border: #d7d9dc;
    --color-border-light: #e0e1e3;
    --color-control-border: #c9ccd0;
    --color-accent: #59758e;
    --color-success: #2d7b4f;
    --color-error: #a53b3b;
    --color-surface: #fff;
    --color-background: #f7f7f5;
    --color-checker: #e6e6e3;
    --color-progress-track: #e0e4e7;
    --radius-small: 5px;
    --panel-padding: 16px;

    color: var(--color-text);
    background: var(--color-background);
    font-family: system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-width: 320px;
}

main {
    width: min(1360px, calc(100% - 32px));
    margin: 0 auto;
    padding: 28px 0 40px;
}

h1, h2, p { margin: 0; }

h1 {
    font-size: 1.5rem;
    font-weight: 650;
}

.topbar,
.preview-header,
.inspector-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.intro {
    margin-top: 6px;
    color: var(--color-muted);
    font-size: 0.92rem;
}

button,
select {
    border: 1px solid var(--color-control-border);
    border-radius: var(--radius-small);
    background: var(--color-surface);
    color: inherit;
    font: inherit;
}

button {
    padding: 8px 12px;
    cursor: pointer;
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.workspace {
    display: grid;
    grid-template-columns: 260px minmax(380px, 1fr) 260px;
    gap: 14px;
    margin-top: 24px;
}

.panel {
    border: 1px solid var(--color-border);
    border-radius: 7px;
    background: var(--color-surface);
}

.panel,
.about-panel,
.changelog-panel {
    padding: var(--panel-padding);
}

.panel h2,
.about-panel h2,
.changelog-panel h2 {
    font-size: 0.95rem;
    font-weight: 650;
}

.messages-panel,
.progress-panel,
.about-panel {
    margin-top: 14px;
}

.version-control {
    display: grid;
    gap: 6px;
    margin-top: 14px;
}

.version-control label {
    color: var(--color-muted);
    font-size: 0.84rem;
}

.version-control select {
    width: 100%;
    max-width: none;
}

.file-list {
    display: grid;
    gap: 8px;
    margin: 10px 0 18px;
    padding: 0;
    list-style: none;
}

.asset-name {
    margin-top: 12px;
    color: var(--color-text);
    font-size: 0.88rem;
    font-weight: 600;
    overflow-wrap: anywhere;
}

.asset-name.is-empty {
    color: var(--color-subtle);
    font-weight: 400;
}

.file-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-subtle);
    font-size: 0.88rem;
    overflow-wrap: anywhere;
}

.file-item.is-supplied {
    color: var(--color-text);
}

.file-mark {
    width: 1.1em;
    color: var(--color-subtle);
    text-align: center;
}

.file-item.is-supplied .file-mark {
    color: var(--color-success);
}

.drop-zone {
    display: block;
    padding: 12px;
    border: 1px dashed #b9bdc2;
    border-radius: var(--radius-small);
    color: var(--color-muted);
    font-size: 0.82rem;
    line-height: 1.45;
    text-align: center;
    cursor: pointer;
}

.drop-zone.is-disabled {
    border-color: var(--color-border-light);
    color: var(--color-disabled);
    cursor: not-allowed;
    pointer-events: none;
}

.drop-zone:hover,
.drop-zone.is-dragging {
    border-color: var(--color-accent);
    background: #f2f6f9;
    color: var(--color-text);
}

.drop-zone strong {
    display: block;
    margin-bottom: 3px;
    font-size: 0.9rem;
}

input[type="file"] { display: none; }

.preview-panel {
    display: flex;
    min-height: 500px;
    flex-direction: column;
}

.preview-header {
    align-items: baseline;
    margin-bottom: 12px;
}

.preview-header span,
.texture-details {
    color: var(--color-muted);
    font-size: 0.8rem;
    text-align: right;
}

.preview {
    display: grid;
    min-height: 390px;
    flex: 1;
    place-items: center;
    overflow: hidden;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-small);
    background-color: #f1f1ef;
    background-image: linear-gradient(45deg, var(--color-checker) 25%, transparent 25%),
    linear-gradient(-45deg, var(--color-checker) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--color-checker) 75%),
    linear-gradient(-45deg, transparent 75%, var(--color-checker) 75%);
    background-size: 24px 24px;
    background-position: 0 0, 0 12px, 12px -12px, -12px 0;
}

canvas {
    display: block;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    image-rendering: pixelated;
}

.replacement {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 12px;
    color: var(--color-muted);
    font-size: 0.84rem;
}

.replacement button {
    padding: 4px 8px;
    font-size: 0.8rem;
}

.quality-control {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: 8px;
}

.quality-control[hidden],
.inspector-row[hidden],
.progress-panel[hidden] {
    display: none;
}

.quality-control input {
    width: 100px;
    accent-color: var(--color-accent);
}

.quality-control output {
    min-width: 2ch;
    color: var(--color-text);
    font-variant-numeric: tabular-nums;
    text-align: right;
}

.inspector-panel {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.inspector-row {
    align-items: baseline;
    font-size: 0.84rem;
}

.inspector-row label {
    color: var(--color-muted);
}

.inspector-row input[type="checkbox"] {
    accent-color: var(--color-accent);
}

select {
    min-width: 0;
    max-width: 130px;
    padding: 6px 8px;
}

select:disabled { opacity: 0.5; }

.progress-panel {
    display: grid;
    gap: 7px;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    color: var(--color-muted);
    font-size: 0.82rem;
}

.progress-value {
    flex: 0 0 auto;
    font-variant-numeric: tabular-nums;
}

.progress-panel progress {
    display: block;
    width: 100%;
    height: 10px;
    overflow: hidden;
    border: 0;
    border-radius: 999px;
    color: var(--color-accent);
    accent-color: var(--color-accent);
}

.progress-panel progress,
.progress-panel progress::-webkit-progress-bar {
    background: var(--color-progress-track);
}

.progress-panel progress::-webkit-progress-bar,
.progress-panel progress::-webkit-progress-value,
.progress-panel progress::-moz-progress-bar {
    border-radius: inherit;
}

.progress-panel progress::-webkit-progress-value,
.progress-panel progress::-moz-progress-bar {
    background: var(--color-accent);
}

.messages {
    display: grid;
    gap: 6px;
    max-height: 130px;
    margin: 12px 0 0;
    padding: 0;
    overflow: auto;
    list-style: none;
    color: var(--color-muted);
    font-size: 0.82rem;
}

.message {
    display: flex;
    gap: 8px;
    line-height: 1.4;
    overflow-wrap: anywhere;
}

.message-icon {
    flex: 0 0 1em;
    color: var(--color-accent);
    text-align: center;
}

.message-success .message-icon { color: var(--color-success); }
.message-error,
.message-error .message-icon { color: var(--color-error); }

@media (max-width: 900px) {
    .workspace { grid-template-columns: 190px minmax(280px, 1fr); }
    .inspector-panel { grid-column: 1 / -1; }
}

@media (max-width: 650px) {
    main { padding-top: 20px; }
    .topbar { align-items: flex-start; flex-direction: column; }
    .workspace { grid-template-columns: 1fr; }
    .inspector-panel { grid-column: auto; }
    .preview-panel { min-height: 420px; }
    .preview { min-height: 300px; }
    .replacement { flex-wrap: wrap; }
}

.about-panel h2,
.changelog-panel h2 {
    margin-bottom: 8px;
}

.about-panel p,
.changelog-list {
    color: var(--color-muted);
    font-size: 0.88rem;
    line-height: 1.5;
}

.about-panel a {
    color: var(--color-accent);
}

.about-panel p + p {
    margin-top: 8px;
}

.changelog-list {
    margin: 0;
    padding-left: 1.25rem;
}

.changelog-list li + li {
    margin-top: 4px;
}

.changelog-list strong {
    color: var(--color-text);
}